Staircase Dimension Calculator
Estimate number of steps, riser height, and run from total rise and tread depth.
Last reviewed by the Radiatus Cloud team
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Work out staircase dimensions
Designing a staircase means fitting the steps to the total rise safely and comfortably. This calculator estimates the number of steps, riser height and run from your total rise and tread depth.
Why staircase proportions matter
A staircase must divide the total height into steps of a consistent, comfortable riser height, too tall is tiring and unsafe, too short is awkward, and the number of steps follows from the total rise divided by a sensible riser. The run, how far the stairs extend horizontally, comes from the steps times the tread depth. Getting these proportions right is a matter of safety and comfort, and building codes set limits on them. Estimating the dimensions from the rise helps you plan a staircase that fits the space and is safe to use.
A planning estimate
These are estimates from a standard method for general planning, not professional advice; confirm anything important for your specific situation. It runs entirely in your browser, so nothing you enter is uploaded and it works without an account, keeping your figures on your own machine.
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Frequently Asked Questions
How is the number of steps found?
By dividing the total rise by a comfortable riser height, giving the number of steps needed to climb the height evenly.
What is riser height and why does it matter?
The height of each step. It must be consistent and within a comfortable, safe range, since too tall is tiring and unsafe, too short awkward.
What is the run?
How far the staircase extends horizontally, calculated from the number of steps times the tread depth, which must fit the available space.
Are there rules on stair dimensions?
Yes. Building codes set limits on riser height and tread depth for safety, so a design should respect the codes for your location.
Is my data uploaded?
No. The calculation runs entirely in your browser.
Privacy & Security
Calculated locally in your browser. Verify with local building codes.
How to Use
Enter total rise and preferred riser/tread to estimate staircase dimensions.
Disclaimer: This tool is provided "as is" without warranty of any kind. Results are for educational and utility purposes.
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